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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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iswlower(3) Library Functions Manual iswlower(3)
iswlower - test for lowercase wide character
Standard C library (libc, -lc)
#include <wctype.h>
int iswlower(wint_t wc);
The iswlower() function is the wide-character equivalent of the
islower(3) function. It tests whether wc is a wide character
belonging to the wide-character class "lower".
The wide-character class "lower" is a subclass of the wide-
character class "alpha", and therefore also a subclass of the
wide-character class "alnum", of the wide-character class "graph"
and of the wide-character class "print".
Being a subclass of the wide-character class "print", the wide-
character class "lower" is disjoint from the wide-character class
"cntrl".
Being a subclass of the wide-character class "graph", the wide-
character class "lower" is disjoint from the wide-character class
"space" and its subclass "blank".
Being a subclass of the wide-character class "alnum", the wide-
character class "lower" is disjoint from the wide-character class
"punct".
Being a subclass of the wide-character class "alpha", the wide-
character class "lower" is disjoint from the wide-character class
"digit".
The wide-character class "lower" contains at least those
characters wc which are equal to towlower(wc) and different from
towupper(wc).
The wide-character class "lower" always contains at least the
letters 'a' to 'z'.
The iswlower() function returns nonzero if wc is a wide character
belonging to the wide-character class "lower". Otherwise, it
returns zero.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────┼───────────────┼────────────────┤
│ iswlower() │ Thread safety │ MT-Safe locale │
└──────────────────────────────┴───────────────┴────────────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of iswlower() depends on the LC_CTYPE category of
the current locale.
This function is not very appropriate for dealing with Unicode
characters, because Unicode knows about three cases: upper,
lower, and title case.
islower(3), iswctype(3), towlower(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.9.1 2024-05-02 iswlower(3)
Pages that refer to this page: isalpha(3), iswctype(3), towlower(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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